209401472 has 64 divisors (see below), whose sum is σ = 481603200. Its totient is φ = 88833024.

The previous prime is 209401457. The next prime is 209401483. The reversal of 209401472 is 274104902.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91154 + ... + 93422.

It is an arithmetic number, because the mean of its divisors is an integer number (7525050).

Almost surely, 2^209401472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209401472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240801600).

209401472 is an abundant number, since it is smaller than the sum of its proper divisors (272201728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209401472 is a wasteful number, since it uses less digits than its factorization.

209401472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2393 (or 2381 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 209401472 is about 14470.7108325749. The cubic root of 209401472 is about 593.8269589331.

The spelling of 209401472 in words is "two hundred nine million, four hundred one thousand, four hundred seventy-two".